Abstract
Derailer is an interactive tool for finding security bugs in web applications. Using symbolic execution, it enumerates the ways in which application data might be exposed. The user is asked to examine these exposures and classify the conditions under which they occur as security-related or not; in so doing, the user effectively constructs a specification of the application's security policy. The tool then highlights exposures missing security checks, which tend to be security bugs.We have tested Derailer's scalability on several large open-source Ruby on Rails applications. We have also applied it to a large number of student projects (designed with different security policies in mind), exposing a variety of security bugs that eluded human reviewers.
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